/Engine/Source/Editor/UnrealEd/Public/Subsystems/UnrealEditorSubsystem.h
Gets information about the camera position for the primary level editor viewport. In non-editor builds, these will be zeroed In the UnrealEd module instead of Level Editor as it usesFLevelEditorViewportClientwhich is in this module
Whether or not we were able to get a camera for a level editing viewport
bool GetLevelViewportCameraInfo ( FVector & CameraLocation, FRotator & CameraRotation )